The device uses the pressure water pumped by water pump in tank to
compress air so as to keep the water in tank under a proper
pressure for the use on board.

Liquid level meter: To show the water level condition in tank.Pressure gauge: To show the pressure in tank.Pressure controller: To control the start and stop of water pump.
When the pressure in tank is under 0.3Mpa, the water pump will
start to feed water into tank until the pressure reaches 0.4Mpa.Safety valve: When the pressure in tank is more than 0.42Mpa, the
safety valve will open to release the pressure in tank.Charge valve: To charge the compressed air into tank.Discharging valve: To empty the water in tank when maintaining.